Tag: flooding

The Salton Sea Was California’s Strangest Catastrophe

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In California’s southeastern desert, the Salton Sea stretches across a wide, shimmering basin, a lake where there shouldn’t be one. At about 340 square miles, it’s the state’s largest lake. But it wasn’t created by natural forces. It was the result of a major engineering failure. I’ve long been fascinated with the place: its contradictions, its strangeness, its collision of nature and human ambition. It reflects so many of California’s tensions: water and drought, industry and wilderness, beauty and decay. And it was only relatively recently that I came to understand not just how the Salton Sea came to exist, but how remarkable the region’s geological past really is, and how it could play a major role in the country’s sustainable energy future.

In the early 1900s, the Imperial Valley was seen as promising farmland: its deep, silty soil ideal for agriculture, but the land was arid and desperately needed irrigation. To bring water from the Colorado River, engineers created the Imperial Canal, a massive infrastructure project meant to transform the desert into productive farmland. But the job was rushed. The canal had to pass through the Mexican border and loop back into California, and much of it ran through highly erodible soil. Maintenance was difficult, and by 1904, silt and sediment had clogged portions of the canal.

The Southern Pacific Railroad was forced to move it lines several times as the raging, unleashed Colorado River expanded the Salton Sea. (Credit: Imperial Irrigation District)

To keep water flowing, engineers hastily dug a temporary bypass channel south of the clogged area, hoping it would only be used for a few months. But they failed to build proper headgates, critical structures for controlling water flow. In 1905, an unusually heavy season of rain and snowmelt in the Rockies caused the Colorado River to swell. The torrent surged downriver and overwhelmed the temporary channel, carving it wider and deeper. Before long, the river completely abandoned its natural course and began flowing unchecked into the Salton Sink, an ancient, dry lakebed that had once held water during wetter epochs but had long since evaporated. (This has happened many times over in the region’s history).

For nearly two years, the Colorado River flowed uncontrolled into this depression, creating what is now known as the Salton Sea. Efforts to redirect the river back to its original course involved a frantic, expensive engineering campaign that included the Southern Pacific Railroad and U.S. government assistance. The breach wasn’t fully sealed until early 1907. By then, the sea had already formed: a shimmering, accidental lake nearly 35 miles long and 15 miles wide, with no natural outlet, in the middle of the California desert.

In the 1950s and early ’60s, the Salton Sea was a glamorous desert escape, drawing crowds with boating, fishing, and waterskiing. Resorts popped up along the shore, and celebrities like Frank Sinatra, Jerry Lewis, Rock Hudson, the Beach Boys, and the Marx Brothers came to visit and perform. It was billed as a new Palm Springs with water, until rising salinity and environmental decline ended the dream. There have been few if any similarly starge ecological accidents like it.

The erosive power of the floodwaters was immense. The river repeatedly scoured channels that created waterfalls, which cut back through the ground, eroding soil at a rate of about 1,200 meters per day and carving gorges 15 to 25 meters deep and more than 300 meters wide. (Credit: Imperial Irrigation District)

The creation of the Salton Sea was both a blessing and a curse for the people of the Imperial Valley. On the one hand, the lake provided a new source of water for irrigation, and the fertile soil around its shores proved ideal for growing crops. On the other hand, the water was highly saline, and the lake became increasingly polluted over time, posing a threat to both human health and the environment.

Recently, with most flows diverted from the Salton Sea for irrigation, it has begun to dry up and is now considered a major health hazard, as toxic dust is whipped up by heavy winds in the area. The disappearance of the Salton sea has also been killing off fish species that attract migratory birds.

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 The New York Times recently wrote about the struggles that farmers face as the Salton Sea disappears, and how the sea itself will likely disappear entirely at some point.

“There’s going to be collateral damage everywhere,” Frank Ruiz, a program director with California Audubon, told the Times. “Less water coming to the farmers, less water coming into the Salton Sea. That’s just the pure math.”

Salton Sea can be beautiful, if toxic (Photo: Wikipedia)

To me, the story of the Salton Sea is fascinating: a vivid example of how human intervention can radically reshape the environment. Of course, there are countless cases of humans altering the natural world, but this one feels particularly surreal: an enormous inland lake created entirely by accident, simply because a river, the Colorado, one of the most powerful in North America, was diverted from its course. It’s incredible, and incredibly strange. What makes the region even more fascinating, though, is that the human-made lake sits in a landscape already full of geological drama.

The area around the Salton Sea is located in a techtonically active region, with the San Andreas Fault running directly through it. The San Andreas Fault is a major plate boundary, where the Pacific Plate is moving north relative to the North American Plate (see our story about how fast it’s moving here). As pretty much every Californian knows, the legendary fault is responsible for the earthquakes and other tectonic activity across much of California.

If you look at a map of the area, you can see how the low lying southern portion of the Salton Sea basin goes directly into the Gulf of California. Over millions of years, the desert basin has been flooded numerous times throughout history by what is now the Gulf of California. As the fault system cuts through the region, the Pacific Plate is slowly sliding northwest, gradually pulling the Baja Peninsula away from mainland Mexico. Over millions of years, this tectonic motion is stretching and thinning the crust beneath the Imperial Valley and Salton Basin. If the process continues, geologists believe the area could eventually flood again, forming a vast inland sea, perhaps even making an island out of what is today Baja California. (We wrote about this earlier.)

Entrance to the Salton Sea Recreation Area (Wikipedia)

Yet even as the land shifts beneath it, the Salton Sea’s future may be shaped not just by geology, but by energy. Despite the ongoing controversy over the evaporating water body, the Salton Sea may play a crucial role in California’s renewable energy future. The region sits atop the Imperial Valley’s geothermal hotspot, where underground heat from all that tectonic activity creates ideal conditions for producing clean, reliable energy. Already home to one of the largest geothermal fields in the country, the area is now gaining attention for something even more strategic: lithium.

An aerial view of geothermal power plants among the farmland around the southern shore of the Salton Sea.
(Credit: Courtesy Lawrence Berkeley National Lab)

Beneath the surface, the hot, mineral-rich brine used in geothermal energy production contains high concentrations of lithium, a critical component in electric vehicle batteries. Known as “Lithium Valley,” the Salton Sea region has become the focus of several ambitious extraction projects aiming to tap into this resource without the large environmental footprint of traditional lithium mining. Gov. Gavin Newsom called the area is “the Saudi Arabia of lithium.” Even the Los Angeles Times has weighed in, claiming that “California’s Imperial Valley will be a major player in the clean energy transition.”

Companies like Controlled Thermal Resources (CTR) and EnergySource are developing direct lithium extraction (DLE) technologies that pull lithium from brine as part of their geothermal operations. The promise is a closed-loop system that produces both renewable energy and battery-grade lithium on the same site. If it proves viable, the Salton Sea could significantly reduce U.S. dependence on foreign lithium and cement California’s role in the global shift to clean energy. That’s a big if…and one we’ll be exploring in depth in future articles.

Toxic salt ponds along the Western shoreline (Photo: EmpireFootage)

Such projects could also potentially provide significant economic investment in the region and help power California’s green energy ambitions. So for a place that looks kind of wrecked and desolate, there actually a lot going on. We promise to keep an eye on what happens. Stay tuned.

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The Great Los Angeles Flood of 1934 was a Disaster That Shaped California’s Approach to Flood Control

A house in the La Crescenta-Montrose area was swept off its foundation and carried several hundred feet by the
New Year’s Eve floodwaters. (LA Times)
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In early 1934, Southern California experienced one of the most tragic and devastating natural disasters in its history as a populated region: the Los Angeles flood of 1934. This flood, largely forgotten today outside of the areas directly affected, struck La Crescenta, Montrose, and other foothill communities with devastating force, reshaping not just the landscape but the way California approached flood management and disaster preparedness. It was one of the deadliest floods in Los Angeles history.

The catastrophe took shape in early January after a period of intense rainfall, likely the product of an atmospheric river, a weather phenomenon that can deliver extreme, concentrated rainfall over a short period. In this case, a series of storms in early 1934 carried moisture from the Pacific Ocean directly into Southern California. The storms brought unusually heavy rain to the region, especially to the steep, fire-scarred San Gabriel Mountains.

Nearly 12 inches of rain poured over the foothills in a span of a few days, saturating the steep slopes of the San Gabriel Mountains. The natural landscape was already vulnerable, scarred by wildfires that had burned through the mountains in recent years, leaving slopes exposed and unable to hold the sudden deluge. At this time, the practice of fire suppression had only just begun, meaning that the region’s dry, chaparral-covered mountainsides were naturally prone to burns, which often created perfect conditions for flash floods in winter. Once the rainfall reached a critical level, water, mud, and debris barreled down the mountains, channeled by steep canyons that funneled the destructive flow toward the communities below.

A worker digs out a car and the remains of a home on Glenada Ave. in Montrose. (LA Times)

La Crescenta and Montrose were hit hardest, with residents astonished by walls of mud and rock rushing down their streets. Homes were swept from their foundations; trees, rocks, and debris clogged roadways, and massive boulders tumbled down, crushing cars, smashing into homes and rolling into the middle of once-busy streets. The disaster destroyed over 400 homes and claimed dozens of lives, and numerous people were injured. The streets were piled with silt and debris, several feet thick, which made rescue efforts nearly impossible at first. Additionally, infrastructure like power lines and bridges was obliterated, leaving the communities isolated and in darkness. The floodwaters, swollen with debris, rushed into homes, sweeping families out into the chaos, while cars and buildings alike were left buried or carried off entirely.

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Believing it to be a secure shelter for the night, a dozen people took refuge in the local American Legion Post 288. Tragically, the building lay squarely in the path of a powerful debris flow that swept down from Pickens Canyon. The force of the flood shattered the hall’s walls, filling it with thick mud that buried everyone inside before surging on its destructive path. Today, a modest memorial honors those lost to the 1934 flood, overlooking the site of the former hall, which has since been converted into part of the flood control infrastructure.

American Legion Hall damaged by flood and mudslide, La Crescenta-Montrose, 1934 (LA Times)

In the aftermath of the tragedy, local and state governments were forced to confront the region’s vulnerability to such floods. At that time, Los Angeles was in the throes of rapid expansion, with more people moving to suburban areas near the San Gabriel Mountains. The flood, along with an even more destructive one in 1938, firmly swayed public opinion toward a comprehensive flood control strategy. The concrete channels that cut through Los Angeles today are part of this system, designed to swiftly carry water past the city and out to the ocean. brought a clear message: these communities needed better protection. As a result, California embarked on an ambitious flood control plan that would shape Los Angeles County’s infrastructure for decades. Engineers and city planners constructed a network of dams, basins, and concrete channels, including structures like the Big Tujunga Dam, to control water flow from the mountains. The Los Angeles River was channeled and paved, transforming it from a meandering, unpredictable river into the hard-lined, brutalist urban waterway we see today. The Arroyo Seco and other channels were also developed as part of this system to divert stormwater, preventing future flood damage in surrounding communities.

People survey the damage to their cars and roads in the aftermath of the flood. (LA Times)

Over the years, this engineering effort proved largely effective in preventing a recurrence of the devastation that struck La Crescenta and Montrose. However, modern critics argue that these concrete channels, while functional, have disconnected Los Angeles from its natural water systems, affecting both wildlife habitats and the local ecosystem. In recent years, the focus has shifted toward exploring more sustainable flood management techniques, with an eye toward revitalizing some of the natural waterways. This includes restoring parts of the Los Angeles River with green spaces, enhancing biodiversity, and creating flood basins that can handle overflow while supporting ecosystems. In this way, the 1934 flood has left a long-lasting impact, as it continues to influence flood control policies and urban planning in the region.

Mud, rocks, and wrecked cars littered Montrose Avenue in Montrose after the New Year’s flooding. (LA Times)

Today, with climate change bringing more extreme weather, Los Angeles is once again reflecting on its flood infrastructure. The LA River Restoration Master Plan is an ambitious project aimed at transforming the Los Angeles River from a concrete flood channel back into a vibrant, naturalized waterway that serves as a green space for local communities. The plan envisions revitalizing the river’s ecosystems, improving water quality, and creating public parks, walking trails, and recreation areas along the river’s 51-mile stretch. By reconnecting neighborhoods and restoring wildlife habitats, it seeks to bring nature back into the urban core. However, the plan comes with significant challenges, including an estimated cost of up to $1.5 billion and complex engineering demands to ensure flood safety while restoring the river’s natural flow and ecology.

Rendering of a section of the LA River part of the Los Angeles River Revitalization Master Plan (Wenk Associates)

The 1934 flood serves as a sobering reminder of the dangers posed by sudden, intense rainfall in fire-prone mountainous regions. As California experiences more intense wildfire seasons, the cycle of fire followed by flood continues to be a significant threat. The legacy of the Los Angeles flood of 1934 underscores the delicate balance required in managing natural landscapes and urban expansion and remains a critical part of understanding how communities can—and must—adapt to an unpredictable climate future.

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